[March, 
172 Analyses of Books-. 
“ generators,” a word which is gradually becoming naturalised 
in England. They then discuss the machines for direCt and in- 
direct currents and the peculiaruses and applications of each kind. 
They next explain automatic switches and the regulation o 
currents. 
We are then introduced to the question of electrical storage, 
with especial notice of the accumulators of Plante, Fauie, an 
others. We must plead guilty of an especial veneration for ac- 
cumulators. For do they not fully typify the man of the time, 
the student who has prepared for and duly passed his examin- 
ations, and is now prepared to let out what has been instil e 
into him minus a certain inevitable percentage of loss ? _ 
The sixth and seventh chapters deal with the physical laws 
bearing on generators and the construction of their several parts. 
In the notice of the employment of the machines in question 
for the production of eleCtric lights we find an explanation in 
detail of the advantages of large generators. . 
The last chapter of the work treats of the use of eleCtncity as 
supplied by these machines for plating, gilding, nickeling, &c., 
for purifying metals and preparing ozone, and for melting the 
most refraCtory metals. _ ... 
The author concludes the body of the work with an anticipation 
of the time when energy will be transmitted in the form of eleCtric 
currents to all the houses of a town, there to be transformed at 
pleasure into heat, light, or motive power. We may rest assured 
that so long as the present state of the law continues, this picture 
will not be realised in Britain. 
Four supplementary chapters then follow, giving formulae for 
the construction of eleCtro-magnets, describing instruments for 
measurement, and the latest constructions of geneiators. 
Finally, we have the complete mathematical theory of magneto- 
and dynamo-eleCtric machines as developed by Clausius. 
Smoke Abatement. Report of Council of the National Smoke 
Abatement Institution, submitted at the Ordinary General 
Meeting Dec. 22nd, 1884. Offices of the Institution : 74, 
Margaret Street, W. 
The most striking feature in this pamphlet is the expression of 
a desire that the smoke-prevention ACts should at no distant 
date be so modified as to entend to dwelling-houses. We fail to 
see how any such measure could be putin force without infliCting 
great hardships upon the householder, who already sees his local 
burdens continually increasing, and his income at the same time 
diminishing. Between a faCtory and a dwelling-house there are 
certain capital distinctions which smoke abators do not duly take 
